Torque indicating wrench



April 9, 1940. w. H. MONTGOMERY TORQUE INDICATING WRENCH I FiledJune 7 19:59

I INVENTOR mum H. MONTGOMERY BY I E 7 ATTORNE Patented Apr. 9,1940

UNITED STATES PATENT OFFICE 2,198,223 'ronoun mmcsrmc wnnncn Walter H. Montgomery, Washington, D. 0.

Application June 7, 1939, Serial No. 277,895 2 Claims. (01. 285-1,

(Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 0. G. 75'!) This invention relates to an improvement in invention including substantially all the objects and features of applicant's prior patent. I

With the foregoing and other objects in view, the invention consists in the construction, combination and "arrangement of parts hereinafter described and fllustrated in the drawing, in which, a Fig. 1 is a top plan view of the wrench of this invention.

Figs. 2, 3 and 4 are tively on lines 2-2, 3-3, and 4-4 of Fig. 1.

There is shown at ID the wrench of this invention which consists of a sleeved handle ll in which is inserted the bifurcated ends l2 and which may be constructed from a single forged sectional views respecl3 of the wrench bar I4. The wrench bar l4,

bar suitably heat treated to provide the necesplates in the prior patent, which are greater in number than two, are rectangular in cross-see 8 tion, and do contact each other. The end I! of leaf I8 is immovably fixed to the sleeve handle II by meansof screws 26 inserted through the side of sleeve handle ll.

. II is bifurcated to provide arecess 2| dividing end l2 into the two projections 22 and 22. These projections 22 and 22 extend on opposite sides of a-bushing 24 rotatably journaled within the sleeved handle I I.

As will be apparent, the end i2 is free to move The'end' l2 of leaf cylindrical base 28 through which extends the indicator operating plunger '20, the indicator 26 being held in the boss 21 by having the boss 21 slitted as at 3| while a knurled thumb screw 82 extending across the slitted portion 3| of boss 21 tightens the slitted portions of the boss 21 on the base 26 to'hold the dial indicator 26 in posi tion. Secured to the leaf H by means of screws 33- is an upstanding finger 64 adapted to be abutted by the plunger an.

In operation, indicator base 28 is placed into the boss 21 so that the plunger 30 is under partial pressure and the thumb screw 32 is tightened to hold it in such position. The wrench is used in the normal manner, the indicator needle 35 having been first set at the zero position on the dial indicator 26 by means of the adjusting screw 36. The wrench may be used then to tighten either a right handed or a left handed nut or bolt, the indicator needle 86 mov- 20 ing to the right or left over the indications, as the case may be. If desired, the leaf I! may be chamfered as at 31 so as to permit the dial indicator 26 to be set at a degree angle relative thereto to permit easier reading.

In using the wrench the operator may watch the movement of the indicating needle 35 over the indications until it reaches the proper indication showing that the desired amount of tension is'placed on the bolt and nut he is putting 30 into position, and thereby avoid the danger of leaving-the bolt and nut either too tight or too loose.

Other modifications and changes in the proportions and arrangements of the parts may be 86 made by those skilled in the art without departing from the nature of the invention, within the scope of what is hereinafter claimed.

onla pin- 26 in the sleeved handle II and will move in one the amount of movement there will be of the.

The invention described herein may be manufactured and/or used by or for the Government 40 of the United States of America for governmental nut cooperating means into said sleeved handle member, said bifurcated shank comprising a pair of bar members, one of said bar members being fixed within said sleeved handle member, and means aiilxed to said handle member and coop- 'eratingwiththeotherofsaidbarmembersto of bar members, one of said bar members being secured within said handle member, the other bar member being slldably guided within said sleeved handle member in the same plane as said first bar member, and indicator means atfixed to said handle member and cooperating with said elidable bar member to indicate the relative longitudinal displacement or the slidable bar member to the first mentioned bar member under bending movement in said plane of said bar members and thereby disclose the tension being applied to the bolt or nut being 10 operated on.

WALTER H. MONTGOMERY. 

